#include<iostream>
#include<vector>
#include<queue>
#include<cstring>
#include<cmath>
#include<map>
#include<set>
#include<cstdio>
#include<algorithm>
#define debug(a) cout<<#a<<"="<<a<<endl;
using namespace std;
const int maxn=1e5;
typedef long long LL;
inline LL read(){LL x=0,f=1;char ch=getchar();	while (!isdigit(ch)){if (ch=='-') f=-1;ch=getchar();}while (isdigit(ch)){x=x*10+ch-48;ch=getchar();}
return x*f;}
LL check(LL x){
    LL sum=0;
    while(x>0){
        sum+=(x%10);
        x/=10;
    }
    return sum;
}
int main(void)
{
  ///cin.tie(0);std::ios::sync_with_stdio(false);
  ///LL t;cin>>t;
 /// while(t--){
    LL n;cin>>n;
    LL k=check(n);
    for(LL i=n+1; ;i++){
        LL x=check(i);
        if(x==k){
            cout<<i<<"\n";
            break;
        }
    }
///}
return 0;
}
